A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Watt hours to Exajoules
Convert Watt-hour (Wh) to Exajoule (EJ) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to exajoules (EJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
EJ = Wh × 3.600000000e-15
Results update instantly for Watt hours to Exajoules conversions.
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Formula
EJ = Wh × 3.600000000e-15
Wh = EJ × 277777777777778
Conversion table
| 1 Wh | 3.600000e-15 EJ |
| 5 Wh | 1.800000e-14 EJ |
| 10 Wh | 3.600000e-14 EJ |
| 20 Wh | 7.200000e-14 EJ |
| 50 Wh | 1.800000e-13 EJ |
| 100 Wh | 3.600000e-13 EJ |
| 500 Wh | 1.800000e-12 EJ |
| 1000 Wh | 3.600000e-12 EJ |
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How the formula works
Both watt-hour and exajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 3.600000000e-15 to get exajoules. To reverse the conversion, multiply a exajoule value by 277777777777778 to get back to watt hours.
Frequently asked questions
What is Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
What is Exajoule (EJ)?
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
How do I convert watt hours to exajoules?
Multiply the watt-hour value by 3.600000000e-15 to get the equivalent in exajoules. For example, 5 Wh × 3.600000000e-15 = 1.800000e-14 EJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.600000000e-15 is an exact, non-rounded value.
Can I convert exajoules back to watt hours?
Yes. Divide the exajoule value by 3.600000000e-15, or multiply it by 277777777777778, to get watt hours.
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About converting watt hours to exajoules
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Use this calculator to move between watt hours and exajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.